Context
You can manually enter the offset value for the relevant sensor relative to the starting point.
When measuring height, offset is normally used to compensate the value read by the sensors placed on the trawl door. If you want to know the height from the door to the seafloor, you must enter the offset value to compensate the distance between
where the sensor is placed on the door and the bottom of the door itself. The distance between the door adapter and the bottom of the door is the relevant offset.
When measuring depth by the depth lid of a sensor, there will always be a deviation in readings of a approximately +/- 1 or 2 m.